al-Sharif al-Radi (d. 406 AH) · Thaqalayn library edition, reproduced verbatim
وَالنّاظِرُ بِالْقَلْبِ، الْعَامِلُ بِالْبَصَرِ، يَكُونُ مُبْتَدَأُ عَمَلِهِ أَنْ يَعْلَمَ: أَعَمَلُهُ عَلَيْهِ أَمْ لَهُ؟! فَإِنْ كَانَ لَهُ مَضَى فِيهِ، وَإِنْ كَانَ عَليْهِ وَقَفَ عِنْدَهُ. فَإِنَّ الْعَامِلَ بَغَيْرِ عِلْم كَالسَّائِرِ عَلَى غيْرِ طَرِيق، فَلاَ يَزِيدُهُ بُعْدُهُ عَنِ الطَّرِيقِ الْوَاضِحِ إِلاَّ بُعْداً مِنْ حَاجَتِهِ، وَالْعَامِلُ بالْعِلْمِ كَالسَّائِرِ عَلَى الطَّرِيقِ الْوَاضِحِ، فَلْيَنْظُرْ نَاظِرٌ: أَسَائِرٌ هُوَ أَمْ رَاجِعٌ؟!
The beginning of the action of one who sees with heart and acts with eyes is to assess whether the action will go against him or for him. If it is for him he indulges in it, but if it is against him he keeps away from it. For, he who acts without knowledge is like one who treads without a path. Then his deviation from the path keeps him at a distance from his aim. And he who acts according to knowledge is like he who treads the clear path. Therefore, he who can see should see whether he should proceed or return.
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